DOI: 10.1002/jgrd.50318
论文题名: Inertia-gravity waves in Antarctica: A case study using simultaneous lidar and radar measurements at McMurdo/Scott Base (77.8°S, 166.7°E)
作者: Chen C. ; Chu X. ; McDonald A.J. ; Vadas S.L. ; Yu Z. ; Fong W. ; Lu X.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 7 起始页码: 2794
结束页码: 2808
语种: 英语
Scopus关键词: Atmospherics
; Gravity waves
; Light velocity
; Radar measurement
; Elevation angle
; Group velocities
; Inertia-gravity waves
; Lidar temperature
; Mesopause region
; Simultaneous measurement
; Temperature data
; Wave properties
; Optical radar
; azimuth
; data set
; gravity wave
; lidar
; mesopause
; radar
; stratosphere
; wave modeling
; wave propagation
; wave property
; Antarctica
; East Antarctica
; McMurdo Station
; Ross Island
; Scott Base
英文摘要: This study presents the first coincident observation of inertia-gravity waves (IGWs) by lidar and radar in the Antarctic mesopause region. This is also the first known observation of two simultaneous IGWs at the same location. An Fe Boltzmann lidar at Arrival Heights (77.8°S, 166.7°E) provides high-resolution temperature data, and a co-located MF radar provides wind data. On 29 June 2011, coherent wave structures are observed in both the Fe lidar temperature and MF radar winds. Two dominant waves are determined from the temperature data with apparent periods of 7.7±0.2 and 5.0±0.1 h and vertical wavelengths of 22±2 and 23±2 km, respectively. The simultaneous measurements of temperature and wind allow the intrinsic wave properties to be derived from hodograph analyses unambiguously. The analysis shows that the longer-period wave propagates northward with an azimuth of θ=11° ±5° clockwise from north. This wave has a horizontal wavelength of λh = 2.2±0.2×103 km and an intrinsic period of τI = 7.9±0.3 h. The intrinsic horizontal phase speed (CIh ) for this wave is 80±4 m/s, while the horizontal and vertical group velocities (Cgh and Cgz ) are 48±3 m/s and 0.5±0.1 m/s, respectively. The shorter-period wave has τI = 4.5±0.3 h and θ = 100°± 4° with λh = 1.1±0.1×103 km and CIh =68±5 m/s. Its group velocities are Cgh = 58±5 m/s and Cgz = 1.1±0.1 m/s. Therefore, both waves propagate with very shallow elevation angles from the horizon (φ = 0.6°±0.1° and φ = 1.1°±0.1° for the longer- and shorter-period waves, respectively) but originate from different sources. Our analysis suggests that the longer-period IGW most likely originates from the stratosphere in a region of unbalanced flow. © 2013. American Geophysical Union. All Rights Reserved. 资助项目: AGS-1139149
; ANT-0839091
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63838
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Aerospace Engineering Sciences, Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado at Boulder, Boulder, CO 80309-0216, United States; Department of Physics and Astronomy, University of Canterbury, New Zealand; Northwest Research Associates, Boulder, CO, United States
Recommended Citation:
Chen C.,Chu X.,McDonald A.J.,et al. Inertia-gravity waves in Antarctica: A case study using simultaneous lidar and radar measurements at McMurdo/Scott Base (77.8°S, 166.7°E)[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(7)